Abstract
A novel ship concept design is significantly an adhoc process. In the preliminary design stage of novel vessels, it is very important to be able to develop an initial estimate of the effects of stiffness and mass distribution on the longitudinal flexural natural frequencies due to different general arrangements in still water at zero speed to satisfy design specifications. For new emerging designs, this estimate has to be made based on a model test. The experiments should also be planned so that scales effects and other features that are not present in full scale case, are minimized. A model with a length of 1.5 meter has been selected. The model was cut into four segments longitudinally and connected by a backbone beam with three elastic hinges joining the four segments. Wet vibration tests were conducted on the model, showed significant influences on the flexural natural frequencies through variations in stiffness and different mass distributions. The whipping frequency was calculated with four degrees of freedom theoretical model to compare with the experimental results. The theoretical model shows a good agreement with the experimental results.
Highlights
Marine vehicles with speeds above 30-35 knots which have recently been used primarily for both passenger transport and military applications are limited to high-speed monohulls and Multihulls
This paper presents the results on investigating the hydroelastic whipping response of a segmented wave piercer bow trimaran model with an emphasis on developing a theoretical model to
A design methodology was developed to investigate the modal frequency of a trimaran ship model through the adjustment of stiffness with an elastic hinge and variety of general arrangements
Summary
Marine vehicles with speeds above 30-35 knots which have recently been used primarily for both passenger transport and military applications are limited to high-speed monohulls and Multihulls. Vakilabadi et al / Analysis of the flexural mode response of a novel trimaran by segmented model test elastic effects can be of particular importance for large high speed vessels. Segmented monohull models have been traditionally developed to measure motions and loads at low Froude numbers as the work reported by Gerritsma et al (1964) and Lloyd et al (1979) This was followed by the evolution of low Froude number hydroelastic segmented models designed to replicate the whipping response of a full-scale vessel in addition to measuring motions and loads for the validation of numerical simulations, McTaggart et al (1997). Dessi et al (2005) have developed an elastically scaled high-speed monohull model used to measure dynamic loads and to replicate the modal response of the full-scale vessel with experimental results showing good correlation with finite element theory for dry tests in air. A theoretical model of a four degree of freedom system using an theoretical hydrodynamic added mass was developed to predict the wet modal frequency of the model as a function of stiffness and mass distributions
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